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LP 1st Stage Adaptors

The Scuba Doctor offers a large variety of low pressure (LP) first stage regulator port adaptors for recreational, technical, rebreather, sidemount and commercial diving applications.

Most low-pressure hoses are 3/8-inch male and most first stage low-pressure ports are 3/8-inch female. A few brands of first stages have a special low-pressure port that is 1/2-inch female, notably some Apex and older Aqualung models. We offer 1/2-inch to 3/8-inch adaptors.

Reminder: The actual configuration of an adaptor is a mirror image of its use. A 3/8"-24 UNF FEMALE port requires a 3/8"-24 UNF MALE adaptor etc. In technical diving operations where many fittings may get co-mingled, be sure that all adaptor combinations can accommodate the intended flows and pressures.

Looking for a particular fitting you don't see here? Let us know and we'll see if we can order it for you.

We reserve the right to limit order quantities to less than 10 pieces because our supply is appropriate for the demands of individual divers, but not bulk orders. Large volume bulk orders will NOT qualify for our free shipping promotion.



Product Image Item Name- Price
3/8" UNF Male x Female Manifold Adaptor for Inspo/Evo Rebreather

3/8" UNF Male x Female Manifold Adaptor for Inspo/Evo Rebreather

3/8" UNF Male x Female Adaptor for standard hoses to connect to Rebreather Manifolds The 3/8" UNF Male x Female Manifold Adaptor allows for a Miflex...
$19.00  $15.00
Save: $4.00 (21%)


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AP Diving LP 3/8" Male Inflator/Regulator Hose Shortener

AP Diving LP 3/8" Male Inflator/Regulator Hose Shortener

The AP Diving LP 3/8-inch Male Inflator/Regulator Hose Shortener lets you shorten, or repair if damaged, a rubber low pressure regulator or inflator...
$29.00  $27.00
Save: $2.00 (7%)


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Mares XR Over Pressure Relief Valve (OPV)

Mares XR Over Pressure Relief Valve (OPV)

The Mares XR Over Pressure Relief Valve (OPV) releases any build up of pressure inside your first stage regulator. Fitted to one of your LP ports...
$30.00  $28.00
Save: $2.00 (7%)


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Sonar LP 3/8" Male to 1/2" Female UNF Adaptor

Sonar LP 3/8" Male to 1/2" Female UNF Adaptor

The Sonar Low Pressure (LP) 3/8 inch Male to 1/2 inch Female UNF adaptor enables you to connect a 1/2" Male end LP hose to any dive regulator that...
$6.00  $5.00
Save: $1.00 (17%)


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Sonar LP 3/8" Male to 3/8" Female 1st Stage Elbow Swivel Adaptor

Sonar LP 3/8" Male to 3/8" Female 1st Stage Elbow Swivel Adaptor

The Sonar Low Pressure (LP) 3/8 inch Male to 3/8 inch Female 1st Stage L-Shaped Elbow Swivel Adaptor redirects a low pressure port on a first stage...
$26.00  $23.00
Save: $3.00 (12%)


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Sonar LP 3/8" Male to 9/16" Male UNF Adaptor

Sonar LP 3/8" Male to 9/16" Male UNF Adaptor

The Sonar Low Pressure (LP) 3/8 inch Male to 9/16 inch Male UNF adaptor converts 1st stage thread to second stage thread. The 3/8"-24 UNF Male end of...
$19.00  $16.00
Save: $3.00 (16%)


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Sonar LP 3/8" Male to Dual 3/8" Female 1st Stage Adaptor

Sonar LP 3/8" Male to Dual 3/8" Female 1st Stage Adaptor

The Sonar Low Pressure (LP) 3/8" Male to Dual 3/8" Female 1st Stage Adaptor is used to increase the number of low pressure ports on a first stage...
$26.00  $23.00
Save: $3.00 (12%)


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Sonar LP 3/8" Male to Three 3/8" Female UNF Adaptor

Sonar LP 3/8" Male to Three 3/8" Female UNF Adaptor

Do you need two more Low Pressure Ports on your Scuba Regulator? Use the Sonar LP 3/8" Male to Three 3/8" Female UNF Triple Adaptor to add two...
$43.00  $39.00
Save: $4.00 (9%)


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Sonar LP 3/8" Male to Two 3/8" Female UNF T-Port Adaptor

Sonar LP 3/8" Male to Two 3/8" Female UNF T-Port Adaptor

Do you need another Low Pressure Port on your Scuba Regulator? Use the Sonar LP 3/8" Male to Two 3/8" Female UNF T-Port Adaptor to add an additional...
$42.00  $38.00
Save: $4.00 (10%)


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Sonar LP 3/8" Male UNF Safety Over Pressure Valve (OPV)

Sonar LP 3/8" Male UNF Safety Over Pressure Valve (OPV)

The Sonar Low Pressure (LP) 3/8 inch Male UNF standard safety Over Pressure Relief Valve (OPV or OPRV) is factory set for 175 to 185 psi for pressure...
$10.50  $9.50
Save: $1.00 (10%)


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